Understanding Sex Chromosomes and Genetic Disorders

What is the primary focus of learning at Hemy High?

• Autosomal chromosomes

• Sex chromosomes

• Mitochondrial DNA

• Ribosomal RNA

Which chromosome is larger and carries more genes?

• Neither carries genes

• X chromosome

• Y chromosome

• Both are the same size

What is a Punnett square used for in genetics?

• To predict the weather

• To calculate the age of fossils

• To predict genotypes of offspring

• To measure chromosome length

What is a carrier in the context of X-linked disorders?

• An individual who shows symptoms of the disorder

• An individual who can pass the disorder without showing symptoms

• An individual with no genetic material

• An individual with two Y chromosomes

Why are XY individuals more prone to recessive X-linked disorders?

• They have two X chromosomes

• They have more dominant alleles

• They have only one X chromosome

• They have no Y chromosome

What happens if an XY individual inherits a recessive allele for an X-linked disorder?

• They will always show the disorder

• They will not show the disorder

• They will become a carrier

• They will inherit a Y-linked disorder

What is a dose-dependent genetic disorder?

• A disorder that affects only males

• A disorder that is always fatal

• A disorder that depends on the amount of a drug taken

• A disorder that varies in severity based on gene copies

How do XX individuals typically show symptoms of dose-dependent disorders?

• They show no symptoms

• They show symptoms only in childhood

• They show mild symptoms

• They show severe symptoms

What is the likelihood of XX individuals showing severe symptoms of X-linked disorders?

• Very likely

• Not very likely

• Always

• Never

What is the main difference in gamete contribution between XX and XY parents?

• XY parents contribute only X chromosomes

• Both contribute only Y chromosomes

• XX parents contribute Y chromosomes

• XX parents contribute X chromosomes, XY parents contribute X or Y